Question

To find the resistance of a gold bangle, two diametrically opposite points of the bangle are connected to the two terminals of the left gap of a metre bridge. A resistance of 4Ω is introduced in the right gap. What is the resistance of the bangle if the null point is at 20 cm from the left end?
1

Answer 1

Answer:

As we know that fir the condition of the null point we must have

R

2

R

1

=

100−L

L

here we know that

R

2

=4Ω

L = 20 cm

so we have

4

R

1

=

80

20

R

1

=1Ω

now we know that bangle is connected at diametrical ends so we have

2

R

=R

1

R=2Ω

Explanation:

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